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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        // 计算1~100之间的所有偶数和
        let i = 1
        let sum = 0
        while (i <= 100) {
            if (i % 2 === 0) {
                sum = sum + i
            }
            i++
        }
        console.log(sum)
    </script>
</body>
</html>